And there was no reason for them to vote to acquit, no upside. They all got their brownie points with the democrat base back home who elected them. Safe vote.
Romney can definitely be blamed for that. We could have had Manchin and maybe others were it not for Romney. The issue is the long run historical view of the impeachment. It will no longer be a "strictly partisan" impeachment. Now it will be a "mostly partisan" impeachment like Clinton's. They had some incentive to cross party lines before but not with the Romney on their side.