When you vote for a Senator, you are not voting for someone to be your friend or lead the nation. You are voting for "their vote". How will that candidate vote on issues that are important to you if they are elected.
If you are happy with the Biden economy, what has happened in the world under his leadership of the free world, his long-term relationship with China through his son, his border policies, and energy policies, then vote for a Democrat whatever his personal ethics are, who will push his policies through Congress.
If you feel that Biden's policies have done enough damage, then vote Republican. You are not voting for a President this election; you are voting on whether the current President needs to be restrained or whether you want more of the same.
Don't get dragged down into the morass of name-calling and fearmongering so often deployed by Democrats because they don't want to talk about the issues.
Now imagine political parties spending hundreds of millions of dollars to distract you from the core question:
Are you better off since Biden took office? If yes, vote Democrat. If no, vote Republican.