Whenever a representative is elected to the U.S. Congress they are required to take an oath on a Bible or by affirmation. They vow to support and defend the Constitution of the United States and to faithfully discharge the duties of the office.
Among those duties is to create a budget and pay government bills. The government default in 2011 caused by the Republicans, cost the taxpayer (you and me) $1.3 billion according to the GAO. Now they are at it again, jobs will be lost, stock markets are in decline, faith in the government to pay its bills are in decline, the economy could shrink by .09 percent and if there is a default the cost could run into the hundreds of billions of dollars.