Should Hillary Clinton be worried if Joe Biden decides to run for president?

Reports indicate that Vice President Joe Biden is thinking of running for president. While recent polls show Former Secretary of State Hillary Clinton maintaining a commanding lead in the Democratic primary, a recent Quinnipiac University poll shows Clinton losing ground in favorability and trustworthiness (as Time notes "with 57 percent of Americans viewing her as neither honest nor trustworthy") in addition to head-to-head match-ups against Republican candidates. These negatives, which also came up in polls in key swing states, were not helped by her use of personal email during her tenure at the State Department being back in the news. It is not all doom and gloom for Clinton as a recent Marist University poll shows her beating all of the potential GOP nominees.

Do you think Clinton should be worried if Biden gets in the race?