hanks. That sounds like it should be officially investigated. Why aren't the Democrats kicking up a fuss to get it done?
Some are trying.
Two circumstances:
American law enforcement is predominantly rightwing and corporate, defending capital and private property with a focus and zeal that warms the Marxist "told you so" unheroic heart ;
overtly political access to US news and information media is very expensive - the news media treats politics as a cash cow.
And of course the left, which hasn't been a functional part of the Democratic Party since Wellstone was killed in a plane crash, has been making as much noise as it can without money or access to "respectable" (large audience, lawyers on retainer) media. The Democratic establishment - having jettisoned the left, libertarian, and most of the liberal, decades ago - would have to reverse itself in public at the behest of disreputable bloggers, fringe pundits, ingrates it has been mocking and slandering for decades, at the same time as it pretzels itself attempting to pander to the "moderate Republican" voters its refugee NeverTrump and Bothsides and SawtheLight floor sweepings loudly proclaim exist in the millions - and after finally getting a few seats at the serious moolah table.
Take Matt Taibbi's career arc, for example. The smart money is on his ending up de facto partnered with Greenwald and cashing in the last of his credibility analyzing the recent "polarization" of American politics by extremists on both sides (the Dems named and discussed individually, the Reps anonymous and never mentioned without mentioning the Dems) for Fox or CNN.
And it's hard to blame him - it's not just the money and ease of life he can have for the ask, but the safety and security. There is no leftwingnut welfare to tide one's family over a loss of reputation or failure of enterprise. If attacked as Acorn was, or Rather, or that southern State governor who's still in jail, Taibbi might have to pay for his own lawyer and ride out years of unemployment. Lefties and liberals who gain reputation and audience via effective denigrations of rightwing authoritarian politics become targets of the planet's most effective slander and abuse operation, which will often co-opt one's former allies and supporters - James O'Keefe videos, the Dan Rather punking, Franken's and Keillor's banishments, were warnings as much as they were operations - while even a carefully calibrated and vaguely allusive defense of a "bothsides" meme on TV (a meme anyone personally targeted by a co-opted faction of the ostensibly Dem or tenured Left punditry might have genuine sympathy for) can earn a sufficiently effective and skilled media-smith guaranteed book sales and a desk at some congenial "independent" think tank.
Taibbi's got kids, and good reason to mistrust his Demside compadres.
Dem Party management has painted itself into a corner and doesn't want to rock the boat, so to speak. As a valuable rightwing authoritarian influence on the "other side", it might even be legally compromised and vulnerable to a serious investigation of these various voting frauds and manipulations itself (Sanders's fate in the primaries has never been really explained)