If it’s Sunday, it’s a reasonable bet as of late that Maryland Gov. Martin O’Malley (D) will be facing off against a well-known Republican on national television.

Maryland Gov. Martin O’Malley (D) speaking about New Jersey Gov. Chris Christie on a previous episode of “Face the Nation” on CBS. (Photo courtesy CBS)

Last Sunday, O’Malley tangled with Wisconsin Gov. Scott Walker (R) on “Face the Nation,” talking primarily about health care.

Such appearances have picked up considerably this year for O’Malley, who is serving his second term as chairman of the Democratic Governors Association.