Hillary Clinton will make it official on Sunday: The former secretary of State, widely considered the frontrunner in the race for the Democratic 2016 White House nomination, is set to formally announce her candidacy via an online video posted to social media, the Chicago Tribune reported.

The 67-year-old will then head to key early voting states, including Iowa and New Hampshire, where she plans to hold events with voters, sources familiar with her campaign told various news outlets. The low-key approach aims "to address some of the key shortcomings of Clinton's 2008 run for the White House, when she often came off as flat and overly scripted before large crowds," the Washington Post had noted earlier this week.

In her second presidential bid, Clinton finds herself in a good position to succeed her rival from the 2008 Democratic primary, President Barack Obama, the Chicago Tribune judged.

Within her party, a strong challenger to the former first lady and New York senator has yet to emerge, though Vice President Joe Biden and former Maryland Gov. Martin O'Malley have both toyed with throwing their hats in the ring.

On Friday morning, the liberal Huffington Post published a fresh epilogue to her 2014 memoir, "Hard Choices," that may well signal some of the themes on which Clinton's campaign plans to focus: It "(evokes) her new status as a grandmother to talk about creating opportunities for all Americans," the New York Times summarized.

"I'm more convinced than ever that our future in the 21st century depends on our ability to ensure that a child born in the hills of Appalachia or the Mississippi Delta or the Rio Grande Valley grows up with the same shot at success that Charlotte will," Clinton wrote, referencing Charlotte Clinton Mezvinsky, the daughter of her and former President Bill Clinton's only child, Chelsea Clinton, and Chelsea's husband, Marc Mezvinsky.

This time around, Clinton is unlikely to downplay how being a woman distinguishes her from the 44 men who have previously become president, as she did in 2008, Reuters noted.

The former secretary has used speaking engagements to underline the importance of gender equality and women's rights, arguing that economic growth, the health of the middle class and the stability of foreign peace treaties are related to a reduction in discrimination, the newswire added.