Bernie Sanders proposed all sorts of ideas that polled well.
You'd think he'd be president with such great ideas that poll well.
Because of the unquestioned effectiveness of the right wing media messaging machine, the arguments against most of what are deemed "progressive" proposals hasn't been about any real aspects of the proposals themselves, the attacks have been against those who champion them as being far outside what the right considers the mainstream. Just last night Lindsey Graham was breathlessly saying that the GOP should cakewalk next year since Biden is the most radical closet liberal this nation has ever seen. Obviously he didn't bother to look at yesterday's polling on Biden's agenda showing with which 2/3rds of America is strongly on board.
Here's the deal: Before the pandemic hit, most of the issues and problems that Biden is seeking to address - all of which he ran on to change/fix, doing precisely what he's doing right now - already existed and were getting worse, along with the growing divide between the have-damn-near-everythings and everyone else who's a missed paycheck or two from personal disaster. The American people have watched the GOP borrow and spend to dole out subsidies and cut the taxes of the most profitable and wealthy sectors of this nation while the majority of workers have actually lost ground when accounting for inflation. All this spending for the those at the top has not stopped our economy from growing, so the fiscal/debt boogeyman just doesn't scare anyone anymore. Top this off with the fact that during the last year and a half, millionaires and billionaires have seen their wealth explode while millions of affected workers line up at food banks and seek relief and aid, many for the first times in their lives, the idea of investing money which will have a direct and positive impact on every Main Street across America doesn't look like radical leftist policy, it looks like common sense based on the needs of non-wealthy taxpayers coast to coast.
Basically, Joe Biden is saying "There's always been money for the rich, so now - at the very moment we're reinventing a post-pandemic economy - let's invest in YOU, the American citizen, and provide YOU with conditions that will improve your lives and your communities and your families. And let's do it by building what we need here in America, with American workers making solid wages again, taking the lead in global innovation and development. And let's pay for this by asking those who've received the lion's share of the wealth to again pay a fairer share of income taxes - but still not as much as they were paying as recently as 4 years ago.
There is nothing "radical" in this message, and it's one the entire GOP has had a year to find a counter to while failing miserably. Trump tried - he lost by 8 million votes - even while individual Republicans made gains in the House. Biden has a near half-century record of moderate centrism. The policies he's calling for today aren't extremist, they make sense based on the conditions they're meant to improve. The public at large gets this and supports the effort. The elected GOP, not so much, largely because it leaves them with nothing politically as a fallback position. If Biden's plans do spur epic growth and greater across-the-board prosperity, they have nothing left to counter them with because "NO" is finally not an option.