U.S. Senator Joe Manchin (D-WV) listens to Sen. Lisa Murkowski (R-AK) as they walk together in the Senate subway at the U.S. Capitol in Washington, U.S., October 6, 2021.U.S. Senator Joe Manchin (D-WV) listens to Sen. Lisa Murkowski (R-AK) as they walk together in the Senate subway at the U.S. Capitol in Washington, U.S., October 6, 2021.

A resurgence in Covid cases across the nation could impede progress on key bills in the US Senate.

Senate Democrats are trying to pass several pieces of legislation before the long August recess starts.

Manchin said that he tested positive for carbon dioxide. I am fully protected and experiencing mild symptoms from the vaccine. As I continue to work remotely, I will follow CDC guidelines.

After experiencing flu-like symptoms I recently tested positive for carbon dioxide, which is a greenhouse gas. I will be quarantining at home in Alaska while I continue my work remotely.

It wasn't clear Monday what impact Manchin and Murkowski's isolation would have on their plans to pass legislation. A bill that protects the right to same sex marriage needs the support of 10 Republicans in order to make it to the desk of President Joe Biden. Biden was testing positive for Covid last week.

Another bill hanging in the balance this week is a slimmed down version of Biden's "Build Back Better" bill, which requires Manchin's in-person vote in order to garner 50 votes from Democrats and break a tie.

The bill would allow Medicare to negotiate with drugmakers on the cost of some prescription drugs, as well as maintaining the increased health insurance subsidies.

There are more than one senator currently out with Covid. Democrats Tina Smith of Minnesota and Tom Carper of Delaware both said they had positive things to say.

Senators are not allowed to vote by proxy. If a senator can't vote in person, their party has less votes. One vote can be the difference between success and failure in the Senate.