The Democratic party was quite cynical in its association with the anti-war movement of the time. As soon as they achieved some electoral success, their actions

The Democratic party was quite cynical in its association with the anti-war movement of the time. As soon as they achieved some electoral success, their actions disavowed themselves (this is unsurprisingly not the only such example). I think this makes it accurate to call the war bipartisan (supported by both parties), even though there was a huge people's movement (largely aligned with one of those parties) opposing it.