According to a "Politico" article, the Biden campaign is running a campaign on the premise that the Democratic base is not nearly as liberal or youthful as perceived. Privately, several Biden advisers acknowledge that their theory is based on polling data and voting trends, contending that the media is pushing the idea of a hyper-progressive Democratic electorate being propagated by a Twitter bubble and being out of touch with the average rank-and-file Democrat. In April 2019, Biden told reporters, "The fact of the matter is the vast majority of the members of the Democratic Party are still basically liberal to moderate Democrats in the traditional sense." Biden also described himself as an "Obama-Biden Democrat". An unspecified Biden adviser said, "There's a big disconnect between the media narrative and what the primary electorate looks like and thinks, versus the media narrative and the Twitter narrative [and] the Democratic primary universe is far less liberal. It's older than you think it is." From April 25 to May 25, 2019, Biden's campaign spent 83% of his total $1.2 million Facebook ad funding on targeting voters 45 years and older. No other top 2020 Democratic candidate has pursued a similar strategy in the primary. Biden, along with Bernie Sanders, has often been perceived as the candidate with the best chance of defeating Donald Trump in the general election. According to "The Washington Post", this may be because of his more moderate policies, or it may be because voters or party leaders believe a white male candidate is more "electable". Joe Biden said that his late son Beau should be running instead of him if he were alive. Biden led most national polls through 2019. During the Iowa caucuses held on February 3, 2020, Biden came in fourth place, earning six pledged delegates. In the New Hampshire primary held on February 11, Biden came in fifth place and did not earn any delegates due to his failure to meet the required 15% eligibility threshold. After poor showings in Iowa and New Hampshire, some media outlets questioned whether Biden's status as the most electable candidate was accurate. Biden won the South Carolina primary election held on February 29. Biden won all 46 counties in the state, winning 48.7% of the popular vote and earning 39 delegates. The win was largely attributed to his support from 61% of African-American voters (African-American voters make up approximately 60% of the Democratic electorate in South Carolina). Before the primary on February 26, Jim Clyburn endorsed Biden. Many cited Clyburn's endorsement as a reason for Biden's wide margin of victory, as Clyburn's endorsement is a deciding factor for many African American voters in South Carolina.