I should have figured that it would be impossible to keep the lid on Obama’s jobs plan until Thursday. It appears that Obama will be proposing a $300 billion package, bigger than I had expected, but not as big as I had hoped. Here’s what we know.

President Barack Obama plans to propose boosting job growth by injecting more than $300 billion into the economy next year mostly through tax cuts, infrastructure spending and direct aid to state and local governments.

Obama would call on Congress to offset the cost of the short-term jobs measures by raising tax revenue in later years. This would be part of a long-term deficit reduction package, including spending and entitlement cuts as well as revenue increases, that he will present next week to the congressional supercommittee charged with finding ways to reduce the nation’s debt.

Almost half the stimulus would come from tax cuts, which include an extension of a two percentage point reduction in the payroll tax paid by workers due to expire Dec. 31 and a new decrease in the portion of the tax paid by employers.

Obama is set to lay out his plans in a Sept. 8 address to Congress as unemployment remains at 9.1 percent more than two years after the recession’s official end. Payroll growth stalled last month… [emphasis added]