Two weeks before Czech regional and senatorial elections, the country’s left-leaning parties appear to be the winners from two years of fiscal austerity measures.

In Czech Television’s fresh polls of likely voters, released Monday, opposition Social Democrats, or CSSD, are set to garner roughly 30% of votes in all of the country’s regional elections on Oct. 19 and 20. The country’s largely unreformed, unrepentant Communist party, or KSCM, finds favour of nearly 20% of voters in the polls.

The...