WASHINGTON -- When President Barack Obama takes the oath of office Monday on the national holiday celebrating Martin Luther King Jr.’s life and vision, the links between the two men will be easy to discern.

Both battled enormous odds to build historic multi-ethnic, multi-racial coalitions, one to advance the cause of civil rights, the other to win the nation’s highest office. Both won the Nobel Peace Price. Both could use soaring rhetoric to inspire millions. Both also had to overcome critics who accused them of socialist or communist sympathies, as well as black activists who maintained that they weren’t strong advocates for African-Americans.

Obama has long encouraged the ties between King and himself. He spoke at the civil rights icon’s Atlanta church on Jan. 20, 2008, a year before his first inauguration. He accepted the Democratic presidential nomination in 2008 on the anniversary of King’s Aug. 28, 1963, “I Have a Dream” speech. He’ll take the oath Monday on a Bible that King used, as well as on one that Abraham Lincoln used.

“What King and Obama have in common is that both are articulate voices, voices being heard at a time when people were listening and wanted to listen,” said Sam Fulwood, a senior fellow at the Center for American Progress, a liberal research center.

The two men, of course, were also different, largely because of their times.

“Making America better in 1968 is different than making America better in 2013. I think they take different paths, but their goal is to use their strengths to help America be America,” said Lonnie Bunch, the director of the Smithsonian’s National Museum of African American History and Culture.

National politics wasn’t an option for King. He was born in 1929 and came of age in a South where the simple act of voting was at best difficult and often impossible for blacks, effectively disenfranchising them in one-fourth of the country.

Even elsewhere, voters showed almost no inclination to elect a black person to any statewide office. It wasn’t until 1966 that Sen. Edward Brooke of Massachusetts became the first black to be elected to the Senate in 85 years. Not until 1989 did Virginia’s Douglas Wilder become the first black person elected governor of a state.

Obama has benefited from a political structure that offers unbridled opportunity. He was born in 1961, shortly after stronger voting-rights laws began empowering blacks and making them an important political force.

Through the years, so-called “race issues” have been less prominent, allowing black politicians to identify more closely with universal issues such as health care or the economy.

“Obama had financial advantages and the support of the Democratic Party,” said Kareem Crayton, an associate professor of law at the University of North Carolina Law School. “King was trying to dismantle a hundred years of exclusion, in violation of federal law and the courts.”

Obama, who as a young community organizer was frustrated that he couldn’t change an ingrained political system, learned to be an insider working from outside the black community. Many black leaders in early 2008 preferred Hillary Clinton as the Democratic nominee.

King was the opposite, drawing his political strength from the black population in the heart of the segregated South, a place where the church was often the heart of the political community.