This combined photo taken on Tuesday, shows the presidential candidates of South Korea's major political parties -- (from left to right) Lee Jae-myung of the liberal Democratic Party, Kim Moon-soo of the conservative People Power Party and Lee Jun-seok of the minor conservative New Reform Party -- greeting their supporters ahead of the June 3 presidential election. (Yonhap)
This combined photo taken on Tuesday, shows the presidential candidates of South Korea's major political parties -- (from left to right) Lee Jae-myung of the liberal Democratic Party, Kim Moon-soo of the conservative People Power Party and Lee Jun-seok of the minor conservative New Reform Party -- greeting their supporters ahead of the June 3 presidential election. (Yonhap)

Democratic Party candidate Lee Jae-myung has embraced center-right politicians to expand his political support base, while People Power Party candidate Kim Moon-soo has targeted a candidacy merger with a conservative minor party to better challenge Lee.

Their different campaign strategies were evident this week, as polls showed that Lee has kept a solid lead against Kim, with less than two weeks to go until the presidential election on June 3.

Lee has called for fighting against "insurrection forces" in parts of the establishment, while the PPP remains divided over the aftermath of the surprise martial law decree by former President Yoon Suk Yeol, who is standing trial for insurrection and left the PPP last week.

Rep. Park Kyung-mee, a spokesperson for the DP's election committee, told reporters on Tuesday that its strategy of building a coalition has expanded to a "grand tent" by gathering politicians "beyond conservatives and progressives."

Among conservative politicians who recently endorsed Lee were Her Eun-a, former leader of the New Reform Party, and former lawmaker Kim Yong-nam of the same party.

In various opinion polls, Lee was ahead of Kim by a comfortable margin. A Realmeter survey released this week showed that Lee garnered 50.2 percent support, trailed by Kim with 35.6 percent and Lee Jun-seok of the NRP with 8.7 percent.

Although Kim has publicly asked the NRP's Lee to merge their candidacies, the NRP candidate has ruled out a possible merger with Kim.

Unless they merge candidacies by Saturday, ballot papers will be printed with their names.

On Wednesday, Lee of the DP will continue his campaign trail in his stronghold of Incheon, west of Seoul, for the third day.

He will kick off the day with a YouTube livestream with his supporters, followed by visits to the districts of Namdong and Bupyeong in Incheon, before wrapping up his day in Gyeyang, the constituency he represents at the National Assembly.

Since starting his Seoul stop on Monday, Lee has been focusing on rallying votes in the capital region, visiting key areas in northern Gyeonggi, such as Uijeongbu, Goyang, Paju and Gimpo, on Tuesday.

Kim of the PPP will also focus his campaign on the greater Seoul area this day to bolster support in the battleground region.

He will participate in a televised debate hosted by the Korea Broadcasting Journalists Club before heading to Goyang on the northern outskirts of Seoul to begin his campaign stops.

Later in the afternoon, Kim will join a rice planting session with young farmers in Goyang and hold a roundtable discussion.

He will then travel to Gimpo to meet with young business owners, in an apparent effort to appeal to young voters. Other stops include Paju, Dongducheon, Yangju and Namyangju. (Yonhap)