Similarly, boasts about Republican achievements in the Senate should be taken with a grain of salt.

All but one Senate race has been decided: a runoff election in Mississippi. Assuming Republicans win that race, the party will have gained two seats from their current razor-thin majority of 51 senators, matching their showing during the 1970 and 2002 elections. But before the 2016 elections, Republicans had the majority with 54 seats; now they have 52.

Claims of widespread voter fraud in the chaotic Florida races for governor and senator are baseless.

The Florida Department of State, which oversees the elections, has said it has seen no evidence of criminal activity, and the Florida Department of Law Enforcement has said it has received no complaints of fraud. Additionally, a federal judge has said he has seen no evidence of wrongdoing in vote tallying in Broward County, where President Trump and Gov. Rick Scott, the Republican candidate in the Senate race, have raised claims of fraud. The county is a populous Democratic stronghold and has a history of poorly managing elections. But that isn’t evidence of fraud.

Florida officials did not mysteriously “find” votes only for Democrats after Election Day. Claims about “missing” and “forged” ballots may sound like nefarious activity, but likely have simple explanations.

Protracted vote tallying, in which election officials continue to count provisional and mail-in ballots after the polls close, is routine. In Florida, the Republican candidates for governor and the Senate also gained votes during the process; though their leads narrowed, both won their races after the recount.

The latest data from the state shows that about 851,000 mail-in ballots were requested — but not submitted — by voters. Up to an additional 5,000 ballots were disqualified by election officials who found that voters’ signatures did not match state records. Those mismatches, however, could be because of signatures changing over time or because of illnesses like a stroke.

Fears of voter impersonation or of undocumented immigrants voting were also wildly exaggerated.

These cases do happen, but are more rare than being struck by lightning, according to the Brennan Center for Justice. Mr. Trump warned of people who “put on a different hat, put on a different shirt, come in and vote again.” But for this kind of fraud to affect an election, an army of voters would need to memorize the addresses and names of people they are impersonating and to produce fake identification or forge signatures; if caught, they would face a criminal penalty of up to a $10,000 fine or five years in prison.