He’s the country’s most vulnerable Senate Democrat up for reelection. Even so, Sen. Jon Ossoff (D-GA) is showing no signs of shifting to the center in a fight over government funding.

Ossoff’s “toss-up” race for a second term in Georgia would typically put him into a camp of potential wildcards, as Republicans paint his opposition to a “clean,” six-week funding bill as a sign he is unwilling to buck his party. With three Democratic caucus members already voting with Republicans, the government could be reopened with five more Senate Democrats.