Your obtrusive and underhanded domestic spying law gets shot down by a democratic procedure?
No problem! Just tack it onto a bill already being considered by the House of Lords and sidestep the whole pesky review process.
Edit: happened like 5 times just last month and could have shut down the government. Now Dodd-Frank is all but dead, campaign donation limits are up from $92k to $777k, the EPA is further defunded, and more - all last minute riders with almost zero debate.
http://www.newsweek.com/what-did-congress-sneak-last-minute-...
How the hell is that even possible
Line item veto would be incredibly dangerous. We'd end up with 100% corporate welfare while the entire foodstamp program would be canceled.