The Democrats have the entire executive branch working for them.
If they do enough harassment and ballot stuffing, anything is possible.
O, it's far worse than that. Since FDR the actual machinery of oppression, the bureaucracy that governs every aspect of life has been securely in Democrat hands, regardless of who wins or loses an election, which they are quite capable of rigging. Their survival used to depend upon Democrat re-election. No longer. They are an independent 4th branch of government and more powerful than the rest. Combine an unscrupulous Executive Branch with a permanently embedded bureaucracy and you have the tyranny under which Americans now live.
How bad is it? The key members of the professional staff of your Republican Congressman are more likely than not to be Democrats. This is another reason why they call the Republicans "The Stupid Party." They are only too happy to collect the reward for cooperation with the "Evil Party" to come up with truly stupid ... and evil ... policies.