This year, WikiLeaks has already released information stolen by unknown hackers from the Democratic leadership in advance of the party's convention.
The 20,000 leaked emails showed how party officials had tried to undermine Clinton's rival Bernie Sanders.
The release of the emails forced the resignation of Debbie Wasserman Schultz, chair of the Democratic National Committee.
Assange said: 'In the case of the DNC leaks for example, we pushed as fast as we could to try and get it in before the Democratic Nomination Conference, because obviously people had a right to understand who it is that they're nominating.
'The same is true here for the US electoral process.'
Tuesday’s anniversary party in Berlin will commemorate the 2006 registration of the domain name wikileaks.org.
WikiLeaks launched in January 2007, with Assange saying it would use encryption and a censorship-proof website to protect sources and publicise secret information.
The site has since published more than 10million leaked documents.
It first caught the world's attention when it released manuals for prison guards at Guantanamo Bay.
But it really hit its stride in 2010, unveiling logs of US military operations in Iraq and Afghanistan and a video showing a US helicopter crew mowing down a group of unarmed civilians - including two journalists - in Baghdad.
That same year, it also published a cache of diplomatic cables from US embassies around the world, deeply embarrassing Washington.
In an interview with Der Spiegel over the weekend, Assange said: 'The most important single collection of material we have published is the US diplomatic cable series.'
But 2010 also saw grave blows to the organization.
Assange was accused of having sex with a woman while she was asleep after the two met at a Stockholm conference.
The white-haired WikiLeaks founder took refuge in the Embassy of Ecuador, London - which granted him political asylum in 2012 after he lost a legal battle to block his extradition to Sweden.
The 45-year-old has always maintained the allegations are false and has refused to travel to Stockholm for questioning due to concerns that Sweden will hand him over to the US to stand trial for espionage.
WikiLeaks has been accused of allowing foreign powers to influence November's presidential election by publishing information which may have been gathered by Russian hackers.
He said: 'We're not going to start censoring our publications because there is a US election. Our role is to publish. We believe in what we're doing. The attacks only make us stronger.'