DeLeonism is a type of socialism that could be considered uniquely American, to some degree. While based in Marxism, DeLeonism is relatively free of the influence of European or Asian Marxist thinkers (Lenin, Kautsky, Luxemburg, Trotsky, Stalin, Mao, etc), and to my knowledge DeLeonist parties were unable to spread outside of the English speaking world, though such organisations did exist in Canada, Great Britain, and Australia.
Anyway, the main thing that strikes me about DeLeonism is its focus on bottom-up workers democracy via the "socialist industrial union" (apparently ignoring work in existing unions?), and its almost naive insistence in a majority-based, relatively peaceful revolution via the ballot box. Theoretically, the socialist industrial union would be the primary organising method for achieving socialism; however a political party would also be used to capture the state apparatus via democratic elections. After the DeLeonist party is voted into power, the state would essentially "legalise socialism", making it possible for the socialist industrial unions to take control of the workplace and actually socialise the economy. At least, this is how I understand the idea. Still, seems kind of strange. Also, as an additional note, DeLeonists have been notoriously hostile to other camps of socialism stemming from either "reformist" traditions (the mass-based Socialist Party of America of the 1900s and 1910s) or "authoritarian" and "state capitalist" traditions (anything having to do with Leninism.) With this information in mind, it seems fairly obvious as to why most other socialists tend to consider DeLeonism "impossiblist."
But I'm getting off topic. The main point of this was to discuss the idea that's been floated by a poster on the Debsian e-mail list (for anyone interested, Debsian is an open list, but is maintained by the Debs Tendency of the Socialist Party USA). This poster, a self-described DeLeonist, has mentioned the idea of a constitutional amendment which would "allow" the workers to take over the means of production. The poster says that he intends to have this as a platform plank in the run for Congress he plans in 2008.
The idea of legislating socialism in my constitutional amendment seems somewhat silly to me, and without any other content about building workers power, winning immediate and transitional demands, etc to back it up, sounds very authoritarian and top-down. Now, I doubt this is the poster's intention, but does seem to focus primarily on this idea of a constitution amendment, while at the same time apparently dismissing the broadly-defined concept of "transitional demands" as mere metaphor.
Still, if he does run, I wish him the best for his campaign, and will most likely support him once if I can find a more detailed platform that he intends to run on (or if he decides to run on the SP platform.) The idea of a constitutional amendment to abolish capitalism doesn't sound like a bad idea in term of getting people talking, but there needs to be more concrete demands backing it up, in addition to a realisation that socialism will probably not come through the election of socialist candidates and parties to power, but rather as a more revolutionary seizure of power my popular protest and workers action from below.