What if Kerry doesn't support the Democrat's Plan to Give Away the Store?

Kerry is apparently not jumping at the chance to endorse Teddy Kennedy's plan to Give Away the Store: see 'Kerry Hesitates as Democrats Promote Immigration Plan'.

Perhaps Kerry realizes this would create a huge backlash from his constituents. For instance, consider the following:

Separately on Tuesday, a Harvard scholar released a study estimating that immigration reduced the wages of U.S. male workers by an average of about 4% from 1980 to 2000, with heavier losses for high school dropouts, Latinos and African Americans. George J. Borjas, a leading immigration economist, said immigrants added to the supply of low-skilled workers, pushing down wages...

Perhaps this is a good chance to educate Kerry's natural constituencies about the effects of the Kennedy plan on their lives.