A mile high blazing example of Republican obstruction was provided just two months ago. The government shutdown. The GOP refusing to pass a budget that did not defund ObamaCare. But the GOP paid a heavy price in the polls for that monumental fuckup.
Lucky for them, Obama's big "you can keep your plan" lie blew up not long after. Most partisans have the memory capacity like that of a goldfish, and so the GOP shutdown thing has already been forgotten and Obama's lie is now front and center.
And the reason that relying on the ACA issues to sail them through the next election is a bad idea but you will not see a single republican here acknowledge that reality. It is sad to see them consistently loose for such obvious reasons and not learn.