There is no significant gerrymandering. Even if there was, it would barely effect vote totals.

Influence on public information is the *only* element of your list that is remotely real. There is no evidence of vote buying. No evidence of voter intimidation or manipulation. Weak evidence of gerrymanders. Weak evidence of any non-normative behavior AT ALL on the elections side of the ledger beyond the informational environment... but that is a much more complicated story.