Mississippi-filed lawsuit now seen as last chance to stop January rate hikes.
R Street Institute pundit says NFIP reforms were too modest.
Measures would delay increases by perhaps four years if they gain passage.
Fourteen conservative, libertarian and free market organizations send letter to Senate leaders ahead of today's cloture vote.
Some connect it to hot topics such as federal risk management, insurers' disaster responses and climate change.
HR 1418, a bill to raise the cap on credit union member business lending, now has 140 co-sponsors, a chief sponsor says.
House passes controversial disaster bill.
Insurance industry officials believe the House will accept the 60-day National Flood Insurance Program extension the Senate passed last week.