There is a pew poll from last week showing broad bipartisan support. I think the mainstream left has PTSD over Trump which is understandable.
Here is another summary of polling data showing broaad support for Ukraine
Americans are strongly supportive of Ukraine and overwhelmingly favor economic sanctions against Russia.
news.gallup.com
The caveat here is there is low support for boots on the ground with a silver lining being high support for NATO and keeping troops in Europe. It's almost a return to the old cold War consensus where proxy wars can become unpopular but the enemy is clear and constant