From Article just above:
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But while Boehner may have backing from the old veterans in his camp, he’s run headlong into the tea-party group of House Republicans who believe that Obama and Senate Democrats would come off the worse if a shutdown actually takes place.
These hard-line Republicans, not all of whom are freshmen, have forced Boehner to play hardball with the Democrats or face a potential threat to his own survival as speaker. This hard-core faction is insisting on no less than the $61 billion spending cut package passed by the House in February, and they’ve refused to back to any proposal that includes smaller reductions. Reid and Senate Democrats have pushed a much smaller reduction of $33 billion. As of Tuesday afternoon, the potential of a shutdown was growing, but could be headed off by a Boehner offer of $40 billion in cuts plus certain policy riders favored by GOP lawmakers.
The split among Republicans breaks somewhat along generational lines, but even more clearly between those who have served in government — either in the state, local or federal level — and those who have never done so.