First you argue against ideological purity, and then you argue for it. Do you have any clue what you're saying, or are you just content to repeat the Cornyn-Steele NRSC/RNC/RINO talking points?
Let me make this very clear:
Political parties are a means to an end, and the Republican Party is NO exception.
Those "ends" follow directly from the party's "fundamental beliefs", i.e., the ones that "must not be compromised to political expediency or simply to swell the party's numbers." The formation and maintenance of a political party demands a set of core beliefs and strict adherence (what you call "ideological purity") to those beliefs, as they are what binds the party together.
More precisely, political parties must find unity in a common purpose, otherwise they become naught but mere agglomerations of factions that will eventually be torn asunder when one faction tries to use another faction as nothing more than a means to its own ends.
The upcoming elections must not be simply about regaining a Republican majority, as the Republicans already held majorities from 2000 to 2006 and it's fairly evident that their majorities accomplished nothing.
There is a timeliness that says Republican majority now before the United States is permanently altered.
The United States has already been permanently altered...by Republicans and Democrats alike.
Liberals have captured Democrat Leadership. Speaker Pelosi and Majority Leader Reid effectively force DINOs to vote party, Pelosi more effectively than Reid.
The Democrats have a common purpose.
What do the Republicans have, other than being anti-Obama and "not the Democrats"?
Do you have any clue... Ad hominem, if you can't attack the position attack the person. Nice.
Let me make this clear ... demands a set of core beliefs and strict adherence.... Some political parties have successfully enforced strict adherence to the party such as USSR Communist Party, Chinese Communist Party, Nazi Party, and their kin.
More precisely, political parties must find unity in a common purpose... Agreed, but not to the point of strict adherence to the party line.
The upcoming elections must not be simply about regaining a Republican majority...The United States has already been permanently altered...by Republicans and Democrats alike. Agreed, but another round of Democrat control may be the coup d'gras
The Democrats have a common purpose. Disagree. Democrats are a big tent party of different interests. The Party Enforcers make the congressmen follow the party line, mostly.