A third party is missing from the debate

Investors in Treasuries.
The Tea Party wants more debt, more wars.  The Progressives want more debt more entitlements.  The two sides damn near agree, except, neither has lenders to back them up.

Both groups are in DC spending the money and bond vigilantes notice that neither group has willing taxpayers. The Senate is completely unable to handle the situation. Neither group is trustworthy with lender money, shutdown, it makes the most sense.