The pending deal to shift Major League Baseball?s Extra Innings package exclusively to DirecTV starting in April is still not ready to be announced, but Senator John Kerry, Democrat of Massachusetts, would like to undo it. In that desire, he is no different from the many fans enraged that Extra Innings ? a 10-channel service that transmits out-of-market games for $179 a year ? will disappear from cable TV homes altogether, and will be available only to DirecTV subscribers or, under baseball?s banner, on mlb.com. ?Here?s what bothers me,? Kerry said yesterday in a telephone interview. ?You get M.L.B. and DirecTV marshaling their forces to go out and make money while cutting out fans. In my judgment, more fans watching games strengthens baseball.?