The only thing Biden has that Obama didn’t is that fiscal conservatives in the GOP had been sent packing into the political wilderness even before Covid, and even moreso after. So, GOP opposition to spending will be on the allocation more than the amounts. That is it for Biden. Every other angle is working against him.And it just so happens, that for the first time since 2010, we have a D-D-D government to make these changes! And Daddy Joe is willing, for the first time in close to 100 years, make the money rain down. Obama had nice maps, but he was all aboard the austerity train.
The Dems barely control the House. They only control the Senate insomuch as they can keep their own caucus united (read: keep everything palatable to the deep red voters of WV and the reddish purple voters of AZ). Obama came in with supermajorities in both houses (and promptly lost them, it is worth noting).
Obama also came in with a lot of political capital in the White House. Biden does not have that in the slightest. It is not controversial to say that the political landscape of the electorate is far more acrimonious than it was in 2009.
Finally, Biden has to deal with a SCOTUS that is far less amenable than Obama did.
So, no, the Democrats do not have a D-D-D government. And what they do have, they have for another ~22 months (barring death and/or retirement, and look how much national attention Scott Brown got for being merely the 41st vote in the Senate opposition), and going too far in any direction will make the midterms very... exciting.
Ironically, though, Biden’s best bet is to just focus on stuff that the GOP could get behind to peel off just enough votes to slap the bipartisan tag on it, and improving normal rail along with the rest of our transportation infrastructure is one of those things.