WASHINGTON (AP) — Congress has sent President Barack Obama a bill to keep highway and transit aid flowing to states for another two months and prevent shutdown of summer construction projects. [...] in this case, the economic benefits of certainty in terms of our infrastructure investments would benefit the job market and the economy in communities all across the country. [...] construction costs have risen and the money the taxes bring in isn't enough to cover transportation spending. The administration proposes to make up the gap between fuel tax revenue and spending with a one-time 14 percent tax on the estimated $2 trillion in untaxed earnings that U.S.