The ruling Liberal Democratic Party has the highest support rate prior to an Upper House election set for July 10, pulling well ahead of opposition parties, a Kyodo News survey has shown.

In a nationwide telephone survey conducted on Saturday and Sunday, 27.3% of respondents said they will vote for the LDP led by Prime Minister Fumio Kishida when casting ballots for the proportional representation seats in the Upper House.

The ruling party was followed by Nippon Ishin no Kai with 7.7% and the Constitutional Democratic Party of Japan with 7.0%. Still, 34.2% remain undecided on which party to vote for, before the official campaigning begins Wednesday.