(CNN) – Ben Affleck won’t run to be the next U.S. senator from Massachusetts.
The actor and director on Monday put an end to the rumors that he might throw his hat in the ring to replace Sen. John Kerry if he is confirmed as secretary of state, saying he plans to advocate for his causes from outside the upper chamber.
"I love Massachusetts and our political process, but I am not running for office,” he wrote in a Facebook post.
“We are about to get a great Secretary of State and there are some phenomenal candidates in Massachusetts for his Senate seat. I look forward to an amazing campaign,” he posted.
The Bay State seat is expected to become vacant next year because Kerry’s colleagues are expected to confirm him as secretary of state. President Barack Obama nominated him for the top diplomatic job on Friday.
Affleck has mused that he would be interested in running for Congress. He had a taste of the legislative branch last week when he testified at a House Armed Services Committee hearing about his Eastern Congo Initiative, an advocacy organization that also gives grants to spur economic and social development in the Democratic Republic of Congo.
He stirred some of the speculation that he would be the latest example of actor-turned-politician with a very noncommittal answer to the question of whether he would seek the seat.
“I'm not one to get into conjecture,” he said on CBS’s “Face the Nation.” “I do have a great fondness and admiration for the political process in this country…But I'm not going to get into speculation about my political future.
"I like to be involved” he said, and “right now I'm really happy being involved from the outside in government.”
His other causes include aiding veterans and fighting domestic hunger.
In his CBS interview, he said his recent movie, “Argo,” has “really become a springboard for dialogue about our relationship with Iran, which is, you know, as Hillary Clinton said, the most pressing foreign policy issue today.”
Earlier on Monday, Ted Kennedy Jr., the son of the late Sen. Ted Kennedy, said he would not seek the seat, citing the timing and family considerations.
Among the Democrats who have indicated interest are Reps. Michael Capuano, Ed Markey and Stephen Lynch.
A recent poll shows that outgoing Sen. Scott Brown would be the frontrunner on the Republican side, if he chooses to seek the seat. In November, Brown lost his bid to hold the seat he won in 2010 after the elder Kennedy’s death.
Gov. Deval Patrick is expected to pick a temporary successor who would serve until a special election is held. By law, the election must take place between 145 and 160 days from the vacancy. The elected successor would serve out Kerry's term, which ends in 2014.