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Ben Cardin is one of the current U.S. Senators representing Maryland. He has served in the Senate since 2007 and is a member of the Democratic Party. His role as a Senator includes proposing legislation, voting on bills, and representing the interests of Marylanders at the federal level.

The other individuals mentioned have held significant political positions but do not currently serve as U.S. Senators. Barack Obama was a U.S. Senator from Illinois before becoming President. John McCain served as a U.S. Senator from Arizona until his passing in 2018. Joe Biden, while also a former U.S. Senator from Delaware before becoming Vice President and then President, is not currently serving as a Senator. Therefore, Ben Cardin is the correct answer, reflecting current representation in the Senate.