Well i'll give you 10 you can choose which 4 u like best:
1.)Marriage Rights
2.)The Decline of Privacy
3.)Another Housing Crisis
4.)A Massive Regulatory Burden( Affordable Care Act)5.)Ending the Drug Crisis/War6.)The Broken Two-Party System
7.)Unfunded Liabilities
8.)The Age of Preemptive War9.)The Collapsing Economy
10.)Restoring Constitutionalism