For example, the ProShares Short S&P500 (NYSEArca: SH) takes a simple inverse or -100% daily performance of the S&P 500 index. Alternatively, for the more aggressive trader, leveraged options include the ProShares UltraShort S&P500 ETF (NYSEArca: SDS), which tries to reflect the -2x or -200% daily performance of the S&P 500, the Direxion Daily S&P 500 Bear 3x Shares (NYSEArca: SPXS), which takes the -3x or -300% daily performance of the S&P 500, and ProShares UltraPro Short S&P 500 ETF (NYSEArca: SPXU), which also takes the -300% daily performance of the S&P 500.

A divided Congress would also mean real immediate regulatory changes on price changes in the pharmaceutical industry. Investors have already been positioning for the outcome through pharma stocks and related ETFs, such as the PowerShares Dynamic Pharmaceuticals Portfolio (NYSEArca: PJP), SPDR Pharmaceuticals ETF (NYSEArca: XPH) and iShares U.S. Pharmaceuticals ETF (NYSEArca: IHE).

Aerospace and defense stocks could also benefit if Congress is unable to make up its mind over any major fiscal tightening. ETF investors can also tap into this market segment through sector-specific plays like the iShares U.S. Aerospace & Defense ETF (BATS: ITA), PowerShares Aerospace & Defense Portfolio (NYSEArca: PPA) and SPDR S&P Aerospace & Defense ETF (NYSEArca: XAR).

For more information on the market sectors, visit our sector ETFs category.