Can I use "The Republican community" to refer to the community of all American people with Republican viewpoints? If not, what else can I use?
The phrase "Republican community" refers only to party membership, not any particular viewpoint. Indeed, the Democratic and Republican platforms have changed drastically over the years, and are now in many ways polar opposites of what they were originally.
The phrase "conservative community" would better describe the group of people who hold the political views that are commonly associated with the modern Republican party (nearly all Republicans are conservative, though not all conservatives are members of the Republican party). There are other words besides conservative that are often used to refer to roughly the same group of people (e.g. right-wing, reactionary), but some of them have negative connotations. Conservative is the word that members of this group generally use to refer to themselves.
I think the expression the Republican electorate comes close to the idea you are suggesting.
With little physical harm, the Klan's nocturnal activities effectively neutralized a significant portion of the Republican electorate.
According to Goeas, a majority of the Republican electorate supports " comprehensive reform" that includes providing citizenship opportunities for undocumented workers.
From Social Movements and American Political Institutions Anne N. Costain, Andrew S. McFarland - 1998 -
Thus, the Christian Right is strong where the Republican electorate was traditionally small. In contrast, movement influence is positively linked to recent Republican presidential voting: in 1996, for instance, Christian Right power was correlated negatively with votes for Clinton and Perot (r = — .28 and — .20, respectively) but ...
Seems reasonable to me:
Community: a group of people having a particular characteristic in common.
In context I'd have no difficulty understanding what you are saying.
I've seen it used in a book title "Young Americans: Land Labour and the Republican Community". It has a slightly different meaning, relating to the community of various groups whose ideas influenced the development of the Republican Party in the period 1860-1900.
The National Reform Association was part of the 19th century Republican Community.
The best phrase depends on context and your intended tone. “Republican community” is not a phrase in common American usage.
In conversational English, “Republicans” or “Republican voters” refers neutrally to both party members and people who tend to support Republican candidates or have viewpoints that track generally Republican. This seems to be closest to what you want based on your question and comments. (“Democrats” has the corresponding meaning.)
When U.S. voters register, states with closed primary elections require each voter to indicate party preference. This preference is easily changed, and no formal affiliation with the party is required. Opinion polls or surveys often describe their results as representing “registered Republican voters.”
Confusingly, “the Republican party” can refer to either supporters broadly or formal affiliation. Common phrases that emphasize party membership as opposed to broad support are “card-carrying Republican” and “dues-paying Republican.” To emphasize partisanship, that is loyalty to the party and its leadership, use “dyed-in-the-wool Republican” or “straight-ticket Republican voter.” Less colorfully, “partisan Republican” has the same meaning. Again, one need not be a member to be a partisan.
Grouping people by viewpoint on issues — Americans sometimes call these litmus-test issues, that is one’s stance on abortion, taxation, social services, and foreign policy tends to be a decent indicator of party sympathy — American politicians are said to “rally the base” or “motivate the base” when they emphasize certain typically emotional issues in seeking to drive up voter turnout. “Republican base” does indicate general alignment on viewpoint but also suggests partisanship. Americans talk about the base mostly around election time.
American political parties are large coalitions. Various “wings” or factions within the Republican party include social conservatives, fiscal conservatives, nationalists, pro-business, constitutionalists, libertarians, national greatness conservatives, foreign policy conservatives, America First, neoconservatives, the Religious Right, and the alt-right. Some Republicans are single-issue voters, that is, some always vote against pro-abortion candidates or others always vote against candidates who support new gun-control measures, for example.
Inflammatory language used to denigrate Republicans includes words and phrases such as “reactionary,” “heartless,” “right-wing,” “right wingers,” “wingnuts,” “moonbats,” “anti-choice,” “patriarchal,” “paternalists,” “fascists,” “xenophobes,” “promoters of war on women,” “theocrats,” “legislating morality,” and “sellouts to corporations.”
“The Republican electorate,” as suggested in another answer, sounds highly and perhaps excessively formal. The phrase is not in common usage.
Note the subtle distinction between Republican and republican. The capitalized proper noun refers to the political party and the latter to the republican form of government.
A term similar to what you describe would be the Republican base.
The party base (for any party), is the collection of people who associate much more strongly with the values of that party than with the values of the other party. That is, they can be enthusiastic about their party's values, or lukewarm towards the party's values but vehemently against the values of the other party. They tend to vote along party lines.
People who volunteer or otherwise get involved in supporting a party effort come almost entirely from the base. But regardless of how active they are, they reliably vote in favor of the party and the party's issues (there's a big difference between agreeing with all of the party's values and voting for the party). The party designs campaigns around that. The base is a group that the party doesn't need to win over.
So the viewpoints of the people in the base may or may not be strongly consistent with the party platform. But the "base" covers a broader range of viewpoints than a term like "conservatives", and describes the collection of people who feel strongly about voting for the party.
I'd suggest Republican-aligned or Republican-favoring or Republican-leaning persons. "Republican leaners" could be a short version.
"Community" suggests people in proximity to or in contact with one another, and it's often the case that Republican favoring people are operating alone, even alone in their immediate families.
Conservative is not bad, noting that there are fiscal conservatives, social conservatives, Constitutional conservatives and blends of each of these. But these don't seem to make up a large portion of Republican leadership or legislators; there are many instances of the current Republican Senate leader stating that he will "crush" conservatives in upcoming elections.
Conservative is also used as a perjorative by those who are not (both Republicans and Democrats), much as "progressive" is used by those on the right. And yet each term is a mantle proudly worn by those that it applies to.