There is a fair bit of artificial and compromising assimilation involved as well...I don't think Bobby Jindal would have gone far if he hadn't converted to christianity, anglicized his name and sold out to the anti-immigrant and quasi-racist republican party...
And I think Indians have hit on a winning strategy here...democratic party which would be more in line with the liberal leaning indian-american outlook is already saturated with minorities...however, republican party is predominately white and is desparate to diversify but only selectively and this is where the indian americans fit in...this is analogous to neocons aligning with republicans, who traditionally would be averse to mostly jewish neocons and vice-versa...similarly Indians offer republican a minority face along with token heterogenous facade and the former could care less about liberal and immigrant issues as long as they get to climb the proverbial social and political ladders...Look for more indians, contrary to their ethos, jump on the republican band wagon...
You bring up an interesting point. I haven't seen a top indian in a democratic party position of power kinda like Booby Jindal. If republicans are only interested in indians due to "diversity", i there they are making a mistake. While; the Indian American community is affluent, it by no means have a voting base similar to latinos or blacks.