Every Republican Senator who's up for re-election should look at voting for a nominee to replace RBG before November as a chance to lose votes. There's no upside to voting "Yes". Republican voters are going to vote to re-elect them and Democratic voters are going to vote against them whether they vote "Yes" or "No". It's the independents who are the key, and pissing off even a handful of them by seconding McConnell's hypocrisy could be costly.