Here's the most appalling explanation I've heard for Senate Republicans' insistence that they will roll right through this:
The deplorables insist on it.
This might seem like poor political calculus, to move forward with the confirmation of a potentially damaged individual. But Republicans aren’t being irrational. While Democrats are appalled, Republicans are listening to a different drummer: the conservative grassroots. Those voters want their Supreme Court justice confirmed, or else they are threatening to stay home on Election Day — and that really could put the Republican majority at risk.
Evangelicals are maybe the single cohort most loyal to Trump and therefore crucial in midterm elections, which will be a referendum on the president. They were already warning Republicans not to withdraw Kavanaugh or else risk electoral disaster before Ramirez came forward. They don’t sound likely to change course now.
“If Republicans were to fail to defend and confirm such an obviously and eminently qualified and decent nominee,” evangelical leader Ralph Reed
told the New York Times last week, “then it will be very difficult to motivate and energize faith-based and conservative voters in November.”
Republicans are favored to hold on to their Senate majority, and possibly increase it, after this year’s elections.
. . . But now that Kavanaugh has been accused of sexual misconduct by at least two women, the conservative base sees a longtime dream of a permanent conservative majority on the nation’s highest court slipping away — and so they are pressuring Republicans to hold firm and confirm him anyway. So far, the GOP is listening.
Kavanaugh's own Federalist Society backers express the political imperative
even more apocalyptically:
The rubber is about to meet the road for Senate Republicans. They have a simple choice: they can vote to confirm Supreme Court nominee Brett Kavanaugh, thereby ending the baseless and unsubstantiated Democrat- and media-fueled smear campaign against him, or they can kiss House and Senate majorities goodbye for the next decade, if not longer.
It seems to me that Republicans spend half their time fulminating against Democrats politicizing the process, and the other half relentlessly politicizing the process. "We want our f#cking justice, we want him f#cking now, and we don't care what any f#cking ladies have to say about it."
That all seems appalling and stupid to me -- particularly with a whole Federalist Society list of right wing judges to choose from -- but then again I'm a liberal, so what do I know?