KEY POINTS
  • The Iowa caucus is Monday, and Vermont Sen. Bernie Sanders is ahead in the polls.
  • If the left-leaning candidate gains momentum and wins Iowa and other primary battles, strategists say market volatility could pick up.
  • So far, investors have been hedging against heightened volatility, seeking safety in bonds and selling health care stocks.
Democratic U.S. presidential candidate Senator Bernie Sanders speaks to supporters and volunteers at a campaign field office in Cedar Rapids, Iowa, February 2, 2020.

Iowa's Democratic presidential caucuses Monday are a step toward narrowing the far-flung field of candidates, and investors could start getting worried if polls prove correct and Bernie Sanders emerges as the winner.

Iowa is just the first ballot, but a win by the Vermont senator could give him more momentum, and that certainly could get the market's attention. Analysts do not expect a sell-off just based on an Iowa win for Sanders, but if he begins to look like the nominee in more races, volatility could increase. New Hampshire's primary is the following week, and Sanders won there in 2016.